Jesus Christ THANK YOU !!!! I'm in a&p school rn took me 3 days of searching to find this video. hands down the BEST one I've seen . You drawing all over with the red boxes is exactly how my brain works!! thank you.
Presenting the counter EMF that is produced in the coil as a manifestation of Lenz's Law will help. Here's the fine details of the reason it take time for full current to flow in the inductor: 1) battery connected to circuit, current starts to flow, magnetic field therefore begins to build up around the wire and the inductor 2) the building-up magnetic field actually causes electromagnetic induction **onto the coil** - the changing magnetic field induces a voltage in the very same wire (the coil) that is creating the initial magnetic field 3) the voltage induced by induction onto the coil by the initial magnetic field IS OPPOSITE the voltage in the circuit and creates current flow/magnetic field IN THE OPPOSITE DIRECTION of the initial magnetic field - *_this is Lenz's Law_* 4) an equilibrium is finally reached - the initial current caused by the battery reaches a maximum. That means the initial magnetic field STOPS CHANGING (stops increasing). Because the initial magnetic field stops changing, the back EMF (Lenz's Law - back or reverse electromotive force, aka reversed voltage) goes away This subtle point is skipped over in many electronics courses. I found what is generally taught is "it takes five (5) L/R time constants for the magnetic field to build up" with no explanation as to 'why.' The 'why' is the SELF-INDUCTION of the primary magnetic field right back into the coil, in the OPPOSITE DIRECTION. The five L/R time constants accurately accounts for the time it takes for the self-induction to stop fighting against the initial current and magnetic field from the battery. Having taught the subject, many students are surprised about the self-induction as the cause for the delay in reaching max current through the inductor. I explain it this way when that happens: 1) "Remember Faraday's law of induction - where a changing magnetic field induces an EMF in a conductor?" (students: 'yes') 2) "Remember Lenz's Law, which completed Faraday's law of electromagnetic induction by putting a negative sign on the induced voltage?" ('yes') 3) "When the battery is first connected to the circuit and current begins to flow and the initial magnetic field begins to build up in the inductor, do we have a changing magnetic field?" ('yes') 4) "Is there a conductor near the changing magnetic field?" ('yes') "Is the COIL the conductor next to the changing magnetic field?" ('yes') 5) "What is the direction of induced EMF (voltage) that occurs in the coil by the changing magnetic field? Hint: Lenz's Law" ('it opposes the initial current from the battery') 6) "So the self-induction onto the coil opposes the initial magnetic field?" ('yes') Some students will say "but shouldn't the coil KNOW that it should not allow its growing magnetic field to trigger Faraday's law of induction ON ITSELF?" to which I say "the wire is not sentient, it does not know. You can say the WIRE IS SELF-DEFEATING if you want" I then point out "if the self induction back onto the coil was NOT in the opposite direction of the initial magnetic field - but was instead in the SAME DIRECTION - the magnetic field would keep growing and growing, which Nature would never allow"
this is just perfectly explained! if you like analogy with water, where voltage is a pressure then its just hits it right in the spot. try to bend a hose (increase resistance) and the pressure builds up. if the pump is pumping that is...) inertia
Ended too soon. The inductor supplied extra voltage for a short time? Was expecting an open switch to allow current to continue to flow. thank you extremely good animation.
Nicely done! I’ve been looking for a good explanation of the internal logic of the 555, and you did a good job. I think your “Build a 555 timer” video will be helpful too!
Reactance would come into play. If the frequency matched the resonance frequency of the two components the current would circulate back and forth and very little current would be drawn from the AC source.
Thank you so much for this, this is really helping me through my electrical fundamentals for my diesel AAS! But I did have a question about the current, when you find all the currents for the parallel circuits, the resistors 1, 6, 7, and 12 world be 1.5 amps, correct? Because that current meets up after it passes through the parallel circuit?
Yes. The current leaving and entering the power supply must always be the same. If the current has only one path it will be the total current (1.5 A) and if the current has more than one path it will split up and the current entering a set of parallel resistors must equal 1.5 A and the same current will leave that set of parallel resistors. Also the highest currents will always flow in the lowest resistors.
I also want to use this system for braking system of automobile. Sir, I want some details about that's copper gauge and number of turn on that coil. And I want to inform that I made an electro magnet but it's not working properly and it can lift only 2 kg.
If you use parts from a microwave oven transformer and use the primary coil (about 14 gauge wire) you should have no problem. There are many reasons an electromagnet may not work as well as the one in the video and I explained the reasons in the comments. The most likely issues are using a higher voltage European microwave and using the secondary coil (high voltage) instead of the primary coil (low voltage - 120 Volt).
I have just come across your tutorials and I am most impressed with your clear explanations. The first one that I saw was the one showing the interaction between an inductor and capacitor and you are quite right to say that the interaction between the two is not emphasised enough. Your video of this explains a lot about the two devices, so well done.
I thought any energy that is stored is called potential energy because the very name indicates that the device has the "potential" (energy) to do work for you. Storing kinetic energy does not make any sense to me because the word kinetic indicates energy that is moving!!
Potential energy is energy possessed by an object due to a force applied to the object (e.g. gravity, spring, etc). Kinetic energy is energy possessed by an object due to it's speed (e.g. high speed car, bullet, etc). A bullet posses very little energy due to it's weight (force of gravity) but it posses a huge amount of energy due to its speed while moving). I suggest that you Google the terms. I electronics the moving electrons posses energy since moving electrons create a magnetic field and this magnetic field posses energy.
Yes, MOSFETS in parallel can control twice the current. Since the gate input capacitance will be twice as high the brief, gate drive current must be higher to quickly drive the two MOSFETs into saturation.
@@DorianMcIntire thank for your reply 😃. planing to drive 4 mosfet in paraller for my scooter. Do u think i will need mosfet driver or just resistor is ok??
I just saw your video now, and have subbed, thanks man, after so many years i finally get a clear and thoughtful explanation. Thank you for your creativity to create a visual for our understanding of a mosfet from our brain end, thanks man.God bless you...
Hey, glad I stumbled upon this video. I copied your sketch and have everything working correctly, the only problem is that the buttons don't stay latched as in your example. When I release the button, the state resorts to reading 5V and back to the state I chose for that. What am I missing? Thanks for taking the time to post these, it's helpful to us newbs.
Yes, you can replace the 9V battery with any voltage that will work with your motor. You must, however, provide a voltage to the Arduino Arduino that is compatible with the controller.
